Hi Chaps, I'm having difficulty setting up forms based authentication with OWA. Setup: Windows 2003 Server Exchange 2003 Server Server in question is the Root CA, and I created a new web server certificate specifically for OWA. I've gone through the whole process of setting this up (assign certificate, enable form based authentication etc etc), and it appeared to be working fine. From our domain I got the log on screen, and was able to log in perfectly over SSL. The problem is with access from outside our LAN/Domain. I get a "This page must be viewed over a secure channel" message when I open http://<OWAserver>/exchange, as expected, but then when I go to https://<OWAserver>/exchange/ a "Page cannot be displayed" error is returned. Now this occurs only if I try to gain access from outside the LAN, so my initial thought was that port 443 was being blocked, but I have been assured by the person responsible for the firewall that this isn't the case. I can't do anything other than take his word for this unfortunately. So the only other issue I can think of is the server certificate. So my actual question is: Is what I described above symptomatic of a bad certificate? My knowledge of certificates isn't very extensive. Is it possible that the certificate would work on the LAN, but not from outside it? Is there a way I can confirm myself that 443 is open? Does this setup require ports other than 443 and 80 to be open? Thank you in advanced, Jason